2 12" Subs in trunk of 2011 Mustang? Ported Box?

I posted this on the mustang forums, and all the guys directed me to this forum. I'm wanting to put 2 12"s in the back of my Mustang. I'm worried that a ported box won't fit, or 2 12"s might be too much. I listen to mostly rap music so I want something that will hit pretty hard. I have the shaker 500 system so I have a subwoofer in the door speaker but it's just not enough.